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  1. Three codons causing chain termination are
    1. TAG, TAA, TGA
    2. GAT, AAT, AGT
    3. AGT, TAG, UGA
    4. UAG, UGA, UAA
Correct Option: D

Termination codons are the stop signals which when encountered cause termination of polypeptide synthesis. They are UAA (ochre), UAG (amber) and UGA (opal). Codons are determined by the sequence of bases on the DNA. Thymine is not present on RNA.



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